For All Intents And Purposes
The phrase “for all intents and purposes” is quite self-explanatory. We use it to essentially mean “in effect” or “virtually.” Unfortunately, many people get this phrase wrong, and it’s not uncommon to see it written down as “for all intensive purposes.”
Source: msn.com
This is what we call a ‘mondegreen,’ which is basically a word or phrase that is commonly misheard or misinterpreted, leading to many people making mistakes while using it. So, the next time you use this phrase, remember to avoid those “intensive” purposes.